Improvement in circular-saw mills



c. J. ELLIOTT & '11. B. McCOOL.

CIRCULARSAW MILL.

No 174 503. Patented Mmm, 1876.

' J2? Mg 5 N.PETERS. PHOTO-LITHOGRAPHER, WASHNGTON, D-.C.

UNITED PATENT orrrcn CHARLES J.ELLIOTT "AND HORAGE B. MOCOOL, OFPOTTSVILLE, PA., ASSIGNORS )F ONE-THIRD THEIR RIGHT TO WILLIAM H.BRIGHT,

or SAME PLAoE.

IMPROVEMENT IN CIRCULAR-SAW lvnLLs.

Specification forming part of Letters Patent No. 174,503, dated March'7, 1876; application filed l January 24, 1876.

To an whom it may concern Be itknown that we, GHARLEs J. ELLIOTT andHORACE B. MGOOOL, of Pottsville, in the county of Schuylkill and Stateof Pennsylvania, have invented a new and useful Improvement inCircular-Saw Mills, which improvement is fully set forth in thefollowing specification, reference being had to the accompanyingdrawings.

Our invention consists in the combination of a revolving base-plate, towhich a saw, and mandrel having a pulley attached to it, are securelyfastened; and suitable belts, pulleys, andmachineny, as shown in theaccompanying' drawings, accomplish the object of our invention.

The idea is fully illustrated in Figures 1 and 21 Fig. 1 is a plan viewof the working apparatus, showing the saw a, revolving plate b, theplate 0, which is made in either one or two parts, and'in which therevolving plate 1) moves in a groove, as is shown in the sectionalviews, Figs. 2 and 3, the pulley e, at-

tached to the mandrel f, and which runs the saw, the hose-pulleys d andd, the drivingpnlleys g g, the straight belt h, the crossed belt K, andthe bolts or lugs l l.

Fig. 2 is a side sectional view of the invention, showing the saw andmethod of running it.

Fig. 3 is a front sectional view of the sawplates b and c, and thepulleys e, d, and d(.

The ordinary method of sawing lumber requires the log to be run backwithout sawing, after a single cut has been made. This requires almostas much power as to make a cut.

By our device we make a out both forward and backward, and thereis nopower lost. As soon as the log has passed the saw we loosen the bolts orlugs Z l, and turn the plate 1) round until the saw is reversed. Thecrossed belt K on the loose pulley d is then slipped on the pulley e,which drives the saw, the

log is run back, and a second cutis made, thus makingthe cuttingcapacity of the saw twofold greater than an ordinary one.

. In ordinary saw-mills one of the greatest causes of the springing andruining of saws is the running back of the log after a cut has beenmade, and the wearing of the saw, while cutting amounts to but littlecompared to the damage done by running the log back without cutting.

By the use of our invention this is prevented, as the log is "out everytime it passes the saw both forward and backward.

By adjusting the saw any desirable distance from the center of the plateI), it may be made to out two boards orplanks of the same size, withouta resetting of the log, the revolving plate I) acting as an eccentricand throwing the saw so much nearer to the log on its re turn past thesaw.

From the drawings it will appear that the mode of working or revolvingthe plate I), which, when turned, reverses the saw, may be accomplishedeither by a rack and pinion, by levers, or by any device desired by theparty using the invention. 7 l

The bolts or lugs ll in Fig. 1 may be operated with springs, weights, orin any other desirable manner, and, their use or purpose is to hold theplate I) firmly in its place.

It will readily be seen that in Fig. 1 the straight belt h gives the sawa forward motion, and that the crossed belt K gives it a reversedmotion. While the plate b is being revolved both belts will be on theloose pulleys d and d, and as soon as the plate is in position theproper belt can be thrown on the pulley e, which will put the saw inoperation. The working of the belts is to be done with the ordinaryslide and leverapparatus.

The plate I) revolves in a groove in the plate 0, and may bestrengthened by guides or rests underneath.

The working parts of the device maybe placed on top of or under thefloor by slight changes of the machinery.

The working of the truck that carries the log is not shown, as it formsno part of the invention.

We claim as our invention- 1. The improved reversible-saw apparatusherein described, consisting of the saw a, the plates b and c, thepulleys d;.d',' and e, mandrel f, the belts h and K, and the bolts orlugs bined and connected as and for the purpose I l, substantially asset forth. described.

2. The combination of the saw a, the re- CHARLES J. ELLIOTT. volvingplate b, the stationary grooved plate HORACE B. MGOOOL. 0, the mandrelf, the pulleys d, d, and e, the Witnesses: straight, belth, the crossedbelt; K, the pul- WILLIAM H. BRIGHT,

leys g g, and the bolts or lugs l Z, all com- MORGAN REED.

